Patent US3556571A successfully refreshed from Google Patents.
US3556571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attachment for a doorknob
Assignee: Individual
•
Filing: 1968-05-28
•
Granted: 1971-01-19
•
Expires: 1988-05-28
Abstract
Abstract AN ATTACHMENT FOR A DOORKNOB WHICH ROTATABLY EMBRACES THE SAME TO PREVENT THE DOORKNOB FROM BEING ROTATED BY SMALL CHILDREN OR THE LIKE. THE ATTACHMENT INCLUDES A HOLLOW CUP MEANS WHICH NORMALLY ENCLOSES THE DOORKNOB AND IS OPERATIVELY CONNECTED TO THE DOORKNOB BY A CONNECTION MEANS. THE CONNECTION MEANS DETACHABLY CONNECTS THE CUP MEANS TO THE DOORKNOB AND PERMITS THE CUP MEANS TO BE MOVED AWAY FROM THE DOOR MEMBER PARTIALLY EXPOSING THE DOORKNOB SO THAT THE DOORKNOB CAN BE SELECTIVELY ROTATED BY A PERSON OTHER THAN THE SMALL CHILD.
Inventors
- 👤 Henry C Laub Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:51
CPC Classifications
E; E05; E05B; E05B13/00; E05B13/001; Y; Y10; Y10S; Y10S292/00; Y10S292/02; Y10S70/00; Y10S70/58; Y10T; Y10T292/00; Y10T292/03; Y10T292/82; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/554; Y10T70/5562; Y10T70/5571
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |